Merge pull request #25 from ttsda/master

ttsda's gitian sigs for 0.9.0 final
laanwj sigs 0.9.0
Luke 0.8.7rc1
laanwj sigs 0.9.1
Michagogo gitian sigs for v0.9.1
Merge pull request #27 from Michagogo/master

Michagogo gitian sigs for v0.9.1
Andreas' signatures for 0.9.1.
Merge pull request #28 from schildbach/sigs-0.9.1

Andreas' signatures for 0.9.1.
Gavin 0.9.1 sigs
ttsda's gitian sigs for 0.9.1 final